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D. T. PEEK. Brakes for Preventing Retrograde Movements in Sewingandnther-Machinery.

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UNITED STATES PATENT QFFICE.

DAVID T. PEEK, OF NEW YORK, N. Y.

IMPROVEMENT IN BRAKES FOR PREVENTING RETROGRADE MOVEMENT IN SEWING ANDOTHER MACHINERY.

Specification forming part of Letters Patent No. 141,166, dated July 22,1873; application filed July 9, 1873.

To all whom it may concern:

Be it known that I, DAVID T. PEEK, of the city, county, and State of NewYork, have invented a new and Improved Mechanical Movement for Sewingand other Machinery; and I do hereby declare the following to be a full,clear, and exact description thereof, which will enable those skilled inthe art to make and use the same, reference being had to theaccompanying drawing forming part of this specification, in whichdrawing- Figure l'represents a sectional side view of my invention.Figure 2 is a similar view of the same when the wheel is arrested in itsretrograde motion. Fig. 3 is a horizontal section of the same.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of a wheel with a corrugatedor scalloped edge, in combination with a roller placed loosely in achamber with an inclined bottom and open toward the scalloped edge ofthe wheel, said chamber being attached to the frame or any otherstationary portion of the machine, in such a manner that when the wheelis turned in the proper direction the scallops on the edge of said wheelkeep pushing the roller up the inclined bottom of its chamber and themotion of said wheel is not stopped; but whenever an attempt is made toturn said wheel in the opposite direction, the roller drops down on theinclined bottom, and it is caught in one of the recesses in the edge ofthe wheel, and by these means the retrograde motion of the wheel iseffectually stopped without exposing any portion of the mechanism to anundue strain.

In the drawing, the letter A designates the fly-wheel or the belt-wheelof a sewing-machine or of any other machine in which it is desirable toavoid a retrograde movement. This wheel is mounted on a shaft, B, whichhas its hearings in a frame, 0, of any suitable form or construction.One or both of the edges of the wheel A are corrugated or scalloped, andon any fixed portion of the frame 0 is secured a chamber, D, that openstoward the scalloped edge of the wheel, and the bot- 1 and 2.- In thischamber I place a roller, I),

which, when the wheel A is at rest, rolls down i on the inclined bottoma and bears against the scalloped edge of the wheel.

If the wheel is rotated in the direction of the arrow marked on it inFig. 1, the projections of its scalloped edge push the roller up on theinclined bottom aof the chamberD and the wheel is free to revolve. Butit an attempt is made to turn the wheel in the direction of the arrowmarked on it in Fig. 2, the roller 1) immediately catches in one of therecesses of the scalloped edge of said wheel and the retrograde motionis effectually prevented. By this arrangement the roller bis not wedgedin between the side or periphery of the wheel and the frame, or any partattached to the frame; but said roller simply forms a stop or keyinserted between one of the projections of the scalloped edge and theinclined bottom of the fixed chamber D the wheel is, therefore, notexposed to any undue side pressure; neither are the bearings of theshaft B exposed to any undue strain, and the wheel can be freely turnedat all times in the right direction, indicated by the arrow in Fig. 1.The same effect will be produced by making the wheel corrugated on itsperiphery, the position of the boxD being changed accordingly.

I do not claim as my invention a roller actin g between the side orperiphery of a wheel and the inclined side of a fixed chamber, suchhaving heretofore been used; but

What I claim as new, and desire to secure by Letters Patent, is r v Thewheel A provided with a corrugated or scalloped edge, in combinationwith a fixed chamber, D, containing a roller, 1), and provided with aninclined bottom, a, substantially as shown and described.

'DAVID T. PEEK.

Witnesses W. HAUFF, E. F. KASTENHUIBER.

